Using strain-enabled collective nuclear spin waves as a quantum memory

11 January 2019
Emil Denning, Technical University Of Denmark

The ability to transfer the information from a highly controllable, but susceptible working qubit to a stable, isolated memory qubit is a tool emerging widely in quantum information theory.

Qubits that interact strongly with their local environment have a natural candidate for a high-fidelity quantum memory in the very same environment, but are at the same time notoriously difficult to control due to the environmental back-action.

Semiconductor quantum dots charged with a single electron feature a rich, but well-isolated nuclear spin environment, which - when handled appropriately - can be operated by the electron.

We show how recent developments in quantum control techniques and discoveries in nuclear spin physics presents an opportunity to manipulate the collective nuclear degrees of freedom through the electron to an extent that allows for coherently transferring and retrieving quantum information between the electron and mesoscopic nuclear spin bath.